Phase resolved PLIF and chemiluminescence for measuring combustion dynamics

Transient behavior of combustion systems has long been a subject of both fundamental and practical concerns. Extreme cases of very rapid changes include the ignition of reacting mixtures and detonation. At the other extreme is a wide range of quasi-steady changes of behavior, for example adjustments of the operating point of a combustion chamber. Between the limiting cases of 'infinitely fast' and 'infinitesimally slow' lie important fundamental problems of time-dependent behavior and a wide array of practical applications. Among the latter are combustion instabilities and their active control, a primary motivation for the work reported in this paper. Owing to the complicated chemistry, chemical kinetics and flow dynamics of actual combustion systems, numerical simulations of their behavior remains in a relatively primitive state. Even as that situation continually improves, it is an essential part of the field that methods of measuring true dynamical behavior be developed to provide results having both fine spatial resolution and accuracy in time. This paper is a progress report of recent research carried out in the Jet Propulsion Center of the California Institute of Technology

Selling Mediation: Mimetic, Distancing, and Appellating Practices in the Marketing of an Emerging Profession

Individuals both within and outside the legal profession have been drawn by the ‘promise’ of mediation. In it they see a means for facilitating communicative exchanges between actors in conflict, which they view as a dramatic improvement on the adversarial practices of the formal legal system. However, despite the appeal of mediation to potential practitioners, there is not yet sufficient consumer demand to sustain the number of people who possess mediation skills. This has resulted in an overcrowded mediation market in which practitioners are forced to market themselves so as to compete for a limited clientele. In this context, the emerging mediation profession, with its still forming regulatory bodies, confronts the challenge of managing the image of mediation in the face of the increased marketing activities of mediators. In this paper we examine these marketing activities (described as mimetic, distancing and appellating practices) and their consequences for the public presentation of the mediation “profession.

Just war and military morale: a brief reflection on the correlation between the legality of war and the moral repercussions for members of US and UK forces arising from the questionable legality of the campaign Iraqi Freedom of March 2003

Does it matter to a member of the military whether the military campaign in which he is taking part is lawful or not? Despite the observation that the crime of aggression (post Kampala 2010) constitutes a ‘leadership crime par excellence,’ which limits any (future) criminal responsibility accordingly, the legality or illegality of any military action under international law can create moral implications for the common foot soldier and mid-level officer and also have a tangible impact on the national legal frameworks under which these forces operate. This short article uses the example of Operation Iraqi Freedom (2003) to discuss the repercussions of a—most likely—illegal military campaign for individual members of democratic armed forces before the background of the present discussion of NATO led action in Libya

Quebradores, dobradores e obedientes: Explorando a mediação de edTPA dos formadores de professores

This article reflects a qualitative exploratory inquiry into the lived experiences of faculty members working within a system of urban schools of education as they supported diverse teacher candidates in completing the Educative Teacher Performance Assessment (edTPA) during its first semesters of high-stakes implementation. Drawing upon questionnaire responses and semi-structured interviews, our findings demonstrate the disparity and variation in the level and kind of support offered to teacher candidates. We discuss the ways that the policy, stance, and the ethical, pedagogical, and logistical dilemmas teacher educators faced as they supported candidates intersected to shape the supports provided. Implications focus on utilization of such test scores for evaluating teacher preparation institutions, faculty relations, and the diversification of the teacher workforce. Este artículo refleja una investigación exploratoria cualitativa sobre las experiencias de vida de formadores  de docentes trabajando en escuelas urbanas mientras apoyaban a candidatos a maestros para completar el programa de Evaluación del Desempeño Educativo (edTPA) durante los primeros semestres de implementación de esta propuesta de consecuencias severas. Nuestros resultados basados en respuestas al cuestionario y entrevistas semiestructuradas, muestran la disparidad y la variación en el nivel y el tipo de apoyo ofrecido a los futuros docentes. Se analizan las formas en que los posicionamientos políticos, éticos, pedagógicos y dilemas logísticos que enfrentaban los formadores de docentes influenciaban como apoyaban a los  futuros docentes. Las conclusiones se centran en la utilización de resultados de este tipo de pruebas para la preparación docentes, la evaluación de las instituciones, las relaciones con los formadores docentes y la diversidad entre los docentes. Este artigo presenta uma pesquisa exploratória qualitativa sobre as experiências de vida dos formadores de professores que trabalham em escolas urbanas, apoiando futuros docentes no processo de completar a avaliação do programa do Rendimento Escolar (edTPA) durante o primeiro semestre de aplicação da presente proposta com consequências severas. Nossos resultados com base nas respostas ao questionário e entrevistas semiestruturadas mostram a disparidade e variação do nível e tipo de suporte oferecido aos futuros professores. as maneiras pelas quais os formadores docentes enfrentavam os dilemas políticos, éticos, educacionais e logísticos influenciava os apoios oferecidos aos futuros professores. Os resultados focam na utilização dos resultados de tais testes para preparação de professores, avaliação das instituições, as relações com formadores de professores e diversidade entre os professores

Electron transport in semiconducting carbon nanotubes with hetero-metallic contacts

We present an atomistic self-consistent study of the electronic and transport properties of semiconducting carbon nanotube in contact with metal electrodes of different work functions, which shows simultaneous electron and hole doping inside the nanotube junction through contact-induced charge transfer. We find that the band lineup in the nanotube bulk region is determined by the effective work function difference between the nanotube channel and source/drain electrodes, while electron transmission through the SWNT junction is affected by the local band structure modulation at the two metal-nanotube interfaces, leading to an effective decoupling of interface and bulk effects in electron transport through nanotube junction devices.Comment: Higher quality figures available at http://www.albany.edu/~yx15212

Design of a fault tolerant airborne digital computer. Volume 2: Computational requirements and technology

This final report summarizes the work on the design of a fault tolerant digital computer for aircraft. Volume 2 is composed of two parts. Part 1 is concerned with the computational requirements associated with an advanced commercial aircraft. Part 2 reviews the technology that will be available for the implementation of the computer in the 1975-1985 period. With regard to the computation task 26 computations have been categorized according to computational load, memory requirements, criticality, permitted down-time, and the need to save data in order to effect a roll-back. The technology part stresses the impact of large scale integration (LSI) on the realization of logic and memory. Also considered was module interconnection possibilities so as to minimize fault propagation

Chiral molecular films as electron polarizers and polarization modulators

Recent experiments on electron scattering through molecular films have shown that chiral molecules can be efficient sources of polarized electrons even in the absence of heavy nuclei as source of a strong spin-orbit interaction. We show that self-assembled monolayers (SAMs) of chiral molecules are strong electron polarizers due to the high density effect of the monolayers and explicitly compute the scattering amplitude off a helical molecular model of carbon atoms. Longitudinal polarization is shown to be the signature of chiral scattering. For elastic scattering, we find that at least double scattering events must take place for longitudinal polarization to arise. We predict energy windows for strong polarization, determined by the energy dependences of spin-orbit strength and multiple scattering probability. An incoherent mechanism for polarization amplification is proposed, that increases the polarization linearly with the number of helix turns, consistent with recent experiments on DNA SAMs.Comment: 5 Pages, 4 figure

Nod1 signaling overcomes resistance of S. pneumoniae to opsonophagocytic killing

Airway infection by the Gram-positive pathogen Streptococcus pneumoniae (Sp) leads to recruitment of neutrophils but limited bacterial killing by these cells. Co-colonization by Sp and a Gram-negative species, Haemophilus influenzae (Hi), provides sufficient stimulus to induce neutrophil and complement-mediated clearance of Sp from the mucosal surface in a murine model. Products from Hi, but not Sp, also promote killing of Sp by ex vivo neutrophil-enriched peritoneal exudate cells. Here we identify the stimulus from Hi as its peptidoglycan. Enhancement of opsonophagocytic killing was facilitated by signaling through nucleotide-binding oligomerization domain-1 (Nod1), which is involved in recognition of γ-D-glutamyl-meso-diaminopimelic acid (meso-DAP) contained in cell walls of Hi but not Sp. Neutrophils from mice treated with Hi or compounds containing meso-DAP, including synthetic peptidoglycan fragments, showed increased Sp killing in a Nod1-dependent manner. Moreover, Nod1-/- mice showed reduced Hi-induced clearance of Sp during co-colonization. These observations offer insight into mechanisms of microbial competition and demonstrate the importance of Nod1 in neutrophil-mediated clearance of bacteria in vivo